CN101312236B - Lithium-ion secondary battery - Google Patents
Lithium-ion secondary battery Download PDFInfo
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- CN101312236B CN101312236B CN2008100886290A CN200810088629A CN101312236B CN 101312236 B CN101312236 B CN 101312236B CN 2008100886290 A CN2008100886290 A CN 2008100886290A CN 200810088629 A CN200810088629 A CN 200810088629A CN 101312236 B CN101312236 B CN 101312236B
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- rechargeable battery
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0431—Cells with wound or folded electrodes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/70—Carriers or collectors characterised by shape or form
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/534—Electrode connections inside a battery casing characterised by the material of the leads or tabs
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The present invention provides a lithium-ion secondary battery which can suppress internal resistance to a small value. The lithium-ion secondary battery includes a winding group obtained by winding a positive electrode plate and a negative electrode plate via a separator. An end portion of a positive electrode mixture non-application portion projects at an upper portion of the winding group, while an end portion of a negative electrode mixture non-application portion projects at a lower portion of the winding group. Current collecting disks are disposed on both end faces of the winding groupso as to face them, respectively, and materials for the current colleting disks are the same materials as those for a positive electrode current collector and a negative electrode current collector. An end portion of the positive electrode mixture non-application portion 1 is joined to a face of the current collecting disk positioned on the side of the winding group at a plurality of joint portions on the positive electrode side, while an end portion of the negative electrode mixture non-application portion is joined to a face of the current collecting disk positioned on the side of the winding group at a plurality of joint portions on the negative electrode side. Some of the joint portions form joint portions taking on a width expansion shape gradually expanding from a joint end portion with the positive electrode mixture non-application portion toward the current collecting disk. A volume of the joint portion is increased.
Description
Technical field
The present invention relates to lithium rechargeable battery, be particularly related to such lithium rechargeable battery: have electrode body, this electrode body constitutes by positive plate and negative plate are disposed across dividing plate, described positive plate is coated with the cathode mixture based on positive active material on collector body, described negative plate is coated with the negative pole intermixture based on negative electrode active material on collector body.
Background technology
The lithium rechargeable battery of representing lithium secondary battery is high power capacity, high-energy-density, thus as the power supply of the electric car of response environment problem, hybrid vehicle with or the battery used of electric tool and noticeable.Electric car requires acceleration performance and grade climbing performance etc., and the battery that its power supply is used is pursued the lithium rechargeable battery of the high efficiency orientation corresponding with high current charge-discharge.In the battery of such high efficiency orientation, reduce internal resistance in order to improve output performance, to pay much attention to.
Usually, in lithium rechargeable battery, positive/negative plate applies the intermixture contain active material respectively on collector body, and the electronics that the reaction by active material produces is assembled and emitted to outside batteries to the current collection parts from collector body.Collector body uses paper tinsel, film or the perforated plate etc. of metal with conductivity etc.In order to assemble electronics to the current collection parts, adopted and rectangle (short Books shape) broach shape is processed in the end of collector body and has been connected to the technology on the current collection parts and utilizes the collector plate (collection Electricity タ Block) that is installed on the collector body the technology that couples together between collector body and the current collection parts from collector body.For example, disclose on collector body a plurality of collector plates have been installed, the end unification of collector plate has been connected to technology (for example, with reference to TOHKEMY 2001-283824 communique) on the terminal.
But, collector body to be implemented the processing of rectangle broach shape or installed in the technology of collector plate, processing and the operation of installing need the time, so can make the manufacturing decrease in efficiency when industrial mass manufacture.In addition, owing to be processed into rectangle broach shape, so also there are problems such as the amount of abandoning of collector body increases, stock utilization step-down.Under the situation of using such collector body, positive/negative plate is being wound up when making electrode body across dividing plate, because the rotary centrifugal force of reeling, the end of rectangle broach shape and collector plate are expansion radially, collector plate etc. are engaging-in sometimes in electrode body.Its result is, the insulation between both positive and negative polarity is impaired and produce short circuit, causes so-called operation bad.Have again, because collector plate etc. is crooked and be connected to the lateral margin of current collection parts in the mode of the end face of coated electrode body, so can hinder the infiltration of electrolyte.Its result is that required time elongated (in system time increase) becomes the main cause that causes cost to rise during injecting electrolytic solution.For addressing these problems, such technology is disclosed: the convex shaped part of the one side side of the current collection parts that are formed with convex shaped part on the two sides is contacted with the ora terminalis of the collector body that is the stratiform configuration, convex shaped part irradiation energy line to the another side side, thereby current collection parts and collector body are welded (for example, with reference to TOHKEMY 2004-172038 communique).
But, in the technology of TOHKEMY 2004-172038 communique, owing to do not need the processing and the collector plate of rectangle broach shape, so can not produce the problem of required time such as above-mentioned processing etc., but it is owing to be formed with convex shaped part, so excessive sometimes by welding the puddle that forms on the two sides of current collection parts.Though increasing, the volume of the bonding part by making collector body and current collection parts can expect reducing of internal resistance, but because the part that does not touch at collector body on the current collection parts has also formed puddle, so have no alternative but carry out the welding of unnecessary volume part, this becomes the main cause that cost raises.In addition, because puddle is excessive, therefore also may cause the damage of dividing plate and the short circuit between the both positive and negative polarity.Situation according to current collection and current collection part, the influence of the increase of internal resistance and reliability reduction etc. may increase, so particularly in the lithium rechargeable battery of high efficiency orientation, except considering industrial mass manufacture, guarantee that performance quality and reliability are also very important.
Summary of the invention
The present invention finishes in view of the above problems, and its objective is provides the lithium rechargeable battery that can suppress internal resistance less.
In order to address the above problem, the present invention is a kind of lithium rechargeable battery, it has electrode body, this electrode body constitutes by positive plate and negative plate are disposed across dividing plate, above-mentioned positive plate is coated with the cathode mixture based on positive active material on collector body, above-mentioned negative plate is coated with the negative pole intermixture based on negative electrode active material on collector body, it is characterized in that, the end of at least one side in the collector body of above-mentioned positive plate and negative plate disposes projectedly from the end face of above-mentioned electrode body, the end of above-mentioned collector body is bonded on by a plurality of junction surfaces on the face on above-mentioned electrode side of current collection parts, above-mentioned current collection parts are the material identical with above-mentioned collector body, and to dispose with the opposed mode of the end face of above-mentioned electrode body, at least a portion in the above-mentioned junction surface is from the width of expanding gradually towards above-mentioned current collection parts with the engagement end portion of above-mentioned collector body and increases shape, and make be the quantity at junction surface that width increases shape with respect to the ratio of junction surface sum more than 80%.
In the present invention, because the protrusion end of at least one side in the collector body of positive plate and negative plate is bonded on the face with the electrode side of the current collection parts of the identical material of this collector body by a plurality of junction surfaces, and at least a portion in the junction surface is from the width of expanding gradually towards the current collection parts with the engagement end portion of collector body and increases shape, so be width and increase shape correspondingly, the volume at junction surface increases, so can suppress internal resistance less.
In the present invention, also can be: the junction surface is many curve-likes or linearity ground on the face on the electrode side of current collection parts arranges, and on the face on the electrode side of current collection parts, has convex shaped part between the adjacent junction surface in the junction surface of arranging.At this moment, if the front end of convex shaped part is positioned at the position of more leaning on the current collection component side than the expansion starting position at the junction surface that is width increase shape, then can be easy to form the junction surface that width increases shape.In addition, be positioned at position than the ora terminalis of dividing plate more by the position of current collection component side, then when the joint of collector body and current collection parts, can prevent the damage of dividing plate if be expansion starting position that width increases the junction surface of shape.The junction surface and engagement end portion collector body that is width increase shape also can be for acute angle-shaped.In addition, if the end forms the uncoated portion of cathode mixture or negative pole intermixture at the lateral margin of a side from the collector body of the end face protrusion of electrode body, part or all of uncoated portion protruded from the ora terminalis of dividing plate, and protrude from the end face of electrode body the end of the protrusion of this uncoated portion, then can easily carry out the end of collector body and the joint of current collection parts.Preferably: at least a portion at junction surface is from the width of expanding gradually towards current collection parts linearity ground with the engagement end portion of collector body and increases shape.
According to the present invention, because the protrusion end of at least one side in the collector body of positive plate and negative plate is bonded on the face with the electrode side of the current collection parts of the identical material of this collector body by a plurality of junction surfaces, and at least a portion in the junction surface is from the width of expanding gradually towards the current collection parts with the engagement end portion of above-mentioned collector body and increases shape, therefore, with be width and increase shape correspondingly, the volume at junction surface increases, so can have the effect that can suppress internal resistance less.
Description of drawings
Fig. 1 is the cutaway view of overview that the cylindrical shape lithium rechargeable battery of embodiments of the present invention has been used in expression.
Fig. 2 is the vertical view that schematically shows the positive plate of the cylindrical shape lithium rechargeable battery that constitutes execution mode.
Fig. 3 is the vertical view that schematically shows the negative plate that constitutes the cylindrical shape lithium rechargeable battery.
Fig. 4 is the key diagram of position relation that schematically shows positive plate, negative plate and the dividing plate of the coiling group that constitutes the cylindrical shape lithium rechargeable battery.
Fig. 5 is the stereogram of the current collection disk that uses in the cylindrical shape lithium rechargeable battery.
Fig. 6 is the cutaway view of the convex shaped part that forms on the current collection disk, (A) is illustrated in the convex shaped part of the current collection disk that uses among embodiment 1～embodiment 5 and the embodiment 7, (B) is illustrated in the convex shaped part of the current collection disk that uses among the embodiment 6.
Fig. 7 is the shape of the welding portion of expression when the convex shaped part of current collection disk is carried out laser welding, (A) is the vertical view of the current collection disk before the welding, (B) is the shape after the welding, is the cutaway view along the B-B line in (A).
Fig. 8 is the cutaway view that constitutes the top cover of cylindrical shape lithium rechargeable battery.
Fig. 9 schematically shows at the junction surface of the end of the current collection disk of cylindrical shape lithium rechargeable battery and the uncoated portion of cathode mixture to sentence the acute angle-shaped roughly cutaway view at cone shape junction surface that forms.
Figure 10 schematically shows the cutaway view that forms the junction surface that not have shape expanded at the place, junction surface of the end of the current collection disk of cylindrical shape lithium rechargeable battery and the uncoated portion of cathode mixture.
Figure 11 schematically shows to sentence the obtuse angle shape at the junction surface of the end of the current collection disk of cylindrical shape lithium rechargeable battery and the uncoated portion of cathode mixture and form the roughly cutaway view at cone shape junction surface.
Embodiment
Come with reference to the accompanying drawings the execution mode that has used cylindrical shape lithium rechargeable battery of the present invention is described.
(formation)
As shown in Figure 1, the cylindrical shape lithium rechargeable battery 20 of present embodiment has the coiling group 6 as electrode body, and coiling group 6 is by to make the cross section be that the whirlpool shape constitutes to be wound into across the opposed mode of dividing plate with positive plate and negative plate.Coiling group 6 is accommodated on top and is formed with in the battery case 10 of peristome.
At the coiling center of coiling group 6, used the axle core 12 of acrylic resin system cylindraceous.As shown in Figure 4, in the coiling group 6, the mode that positive plate 2 and negative plate 4 directly do not contact with these two substrates is across the dividing plate 5 of systems such as polyethylene and overlapping, and be wound on a core 12 around.It is that 30 μ m, width are 91mm for (length of the length direction of axle core 12) that dividing plate 5 is set thickness in this example for.Positive plate 2, negative plate 4 and dividing plate 5 are overlapping by this way: be formed on the cathode mixture uncoated 1 (part of collector body) on the positive plate 2 and be formed on the both ends of the surface of opposition side each other that negative pole intermixture uncoated 3 (part of collector body) on the negative plate 4 lays respectively at coiling group 6.Uncoated 3 of uncoated 1 of cathode mixture and negative pole intermixture are configured in the position that leans out 2mm from dividing plate 5 respectively.That is, on the top of coiling group 6, the aluminium foil that constitutes the positive electrode collector of positive plate 2 protrudes, and in the bottom of coiling group 6, the rolled copper foil that constitutes the negative electrode collector of negative plate 4 protrudes.
In the coiling group 6 that constitutes at coiling positive plate 2, negative plate 4 and dividing plate 5, uncoated 1 of the cathode mixture that leans out from dividing plate 5 and uncoated 3 separately part or all of negative pole intermixture are protruded from the ora terminalis of dividing plate 5 respectively, and protrude from the both ends of the surface of coiling group 6 respectively the end of protrusion.By adjusting the length of positive plate 2, negative plate 4 and dividing plate 5, the external diameter of coiling group 6 (as diameter) is adjusted to 38 ± 0.1mm.The internal diameter of coiling group 6 (as diameter) is identical with the external diameter of axle core 12, is 9mm.On the side face complete cycle of coiling group 6, can uncoiling in order to make coiling group 6, be pasted with the splicing tape that has applied bonding agents such as hexyl methacrylate at the single face of polyimides system base material, the terminal part that the coiling of coiling group 6 is finished is fixed.In this coiling group 6, positive plate 2, negative plate 4 all are 50 circles of layeredly reeling, and have promptly formed 50 layers duplexer.
As shown in Figure 1, dispose the current collection disk 7 as current collection parts of gathering, dispose the made of copper current collection disk 7 of gathering from the current potential of negative plate at the downside of coiling group 6 from the aluminum of the current potential of positive plate at the upside of coiling group 6.That is, current collection disk 7 disposes respectively opposed to each other with the both ends of the surface of coiling group 6, and the material of current collection disk 7 is used identical with positive electrode collector and negative electrode collector respectively material.Arbitrary current collection disk 7 of side of the positive electrode, negative side all forms identical shape.
Shown in Fig. 5 and Fig. 7 (A), it is 38.5mm that current collection disk 7 is set diameter in this example for, and thickness is 0.2mm.At the central portion of current collection disk 7, organize 6 sides at coiling and be formed with the protuberance cylindraceous (also with reference to Fig. 1) that is used for fixing on axle core 12.It is trapezoidal convex shaped part 8 that current collection disk 7 has the cross section in the one side side, and the part corresponding with convex shaped part 8 of the another side side of current collection disk 7 forms plane.Convex shaped part 8 is along the radial direction of current collection disk 7 and is formed on four positions radially.That is, about the size of convex shaped part 8, shown in Fig. 6 (A), with respect to thickness 0.2mm, the upper base width setup of current collection disk 7 be 0.2mm, the width setup of going to the bottom is that 0.6mm, height setting are 0.8mm.The length of convex shaped part 8 (in the length of the radial direction of current collection disk 7) is set for: corresponding to the outer circumferential side position with the central side position from the aluminium foil (is the rolled copper foil that protrudes from the bottom of coiling group 6 in negative side) on the top that protrudes from coiling group 6.In other words, convex shaped part 8 forms with the position of interior thoughtful most peripheral is corresponding from (except that the axle core 12) of coiling group 6.
In addition, in the part that does not have convex shaped part 8 of current collection disk 7, promptly in convex shaped part 8 fan-shaped part each other, become a plurality of slits 9 in the logical liquid path of nonaqueous electrolytic solution when being formed with the nonaqueous electrolytic solution fluid injection in battery is made.Slit 9 is formed on four positions with oval shape, and this oval radial direction with current collection disk 7 is long diameter.
As shown in Figure 1, current collection disk 7 is separately fixed at the upper end and the bottom of a core 12 by the protuberance cylindraceous that is formed on central portion.At side of the positive electrode, the end of cathode mixture uncoated 1 (aluminium foil) that protrudes from the top of coiling group 6 utilizes laser welding to be bonded on the lower surface of current collection disk 7 by a plurality of junction surfaces.On the other hand, in negative side, the end of negative pole intermixture uncoated 3 (rolled copper foil) that protrudes from the bottom of coiling group 6 utilizes laser welding to be bonded on the upper surface of current collection disk 7 by a plurality of junction surfaces.In side of the positive electrode, negative side, the shape at junction surface forms identical, below for the purpose of simplifying the description and only side of the positive electrode is described.
As shown in Figure 9, protrude from the end of uncoated 1 of cathode mixture on top of coiling group 6 and the junction surface of current collection disk 7 and the position of convex shaped part 8 and form accordingly, this junction surface is many linearities at the lower surface (coiling is organized the face of 6 sides) of current collection disk 7, promptly the radiation linearity at four positions is arranged.At least a portion in the junction surface, be the junction surface sum formed junction surface 25 more than 80%, junction surface 25 is the width that the engagement end portion with uncoated 1 of cathode mixture rises to expand gradually towards current collection disk 7 linearity ground and increases shape.In other words, junction surface 25 is such width and increases shape: the cross sectional shape of the direction of the shape that is arranged in a straight line (radial direction of current collection disk 7) is expanded gradually with respect to the thickness of uncoated 1 of cathode mixture.The width that is extended at junction surface 25 increases the expansion starting position S of shape, promptly is positioned at than the ora terminalis of the dividing plate 5 that constitutes coiling group 6 more by the position of top (current collection disk 7 sides) with the abutting end of uncoated 1 of cathode mixture.In addition, the expanded-angle P at the junction surface 25 at expansion S place, starting position forms acute angle.In other words, with the engagement end portion place of uncoated 1 of cathode mixture, junction surface 25 becomes acute angle-shaped.
Lower surface at current collection disk 7, the adjacent bond portion (part that does not have aluminium foil) each other that the junction surface of uncoated 1 of cathode mixture is arranged at joint, be formed with along the cross sectional shape of the direction on the surface of uncoated 1 of cathode mixture below (coiling is organized 6 sides) have the protuberance of fillet (cross section is a semicircle shape).The front end of this protuberance is positioned at the position of leaning on top (current collection disk 7 sides) than the expansion starting position S at junction surface 25.
When laser welding, be formed on convex shaped part 8 fusions on the current collection disk 7, and a part of fusion of current collection disk 7 and hanging down downwards from the lower surface 7a of current collection disk 7, forming the cross section is the protuberance of semicircle shape.Have again, part at uncoated 1 butt current collection of cathode mixture disk 7, the puddle that hangs down from lower surface 7a hangs down in the mode on the two sides of the end of soaking uncoated 1 of cathode mixture, the end that cathode mixture is uncoated 1 is fused in the puddle and by integrated, has more been formed the junction surface 25 that width increases shape by the position of downside at the protuberance that than the cross section is semicircle shape.Therefore, the cross section is that the protuberance of semicircle shape is included in the junction surface 25.In addition, before engaged at end with uncoated 1 of current collection disk 7 and cathode mixture, the ora terminalis that cathode mixture is uncoated 1 is connected on the lower surface 7a of current collection disk 7, and after engaging by welding, original end and junction surface 25 that cathode mixture is uncoated 1 are integrated, so the expansion starting position S at junction surface 25 becomes the end of uncoated 1 of cathode mixture.
Above the current collection disk 7 of side of the positive electrode, dispose the discoid top cover 11 that is also used as anodal outside terminal.At the central portion upper surface of current collection disk 7, be welded with thickness and be 0.3mm, width and be the end of positive wire 14 of the aluminum of 16mm.The lower surface of the disk 16 of the other end of positive wire 14 and formation top cover 11 is bonded together by laser welding.On the other hand, below the current collection disk 7 of negative side, dispose thickness and be the discoideus negative wire 13 that the central portion of the nickel system of 0.5mm protrudes to the opposition side of coiling group 6.The peripheral part upper surface of negative wire 13 is bonded on the lower surface of current collection disk 7 by ultrasonic bonding.The central portion lower surface of negative wire 13 is bonded on the inner bottom surface of the battery case 10 that is also used as negative outer terminal by resistance welded.Use implemented nickel plating iron that round-ended cylinder shape container is arranged in the battery case 10, in this example, thickness setting is 0.5mm.Have again,, increase the welding position of negative wire 13 and battery case 10 outside irradiating laser of battery case 10 from the bottom surface.
As shown in Figure 8, top cover 11 is formed by the cap 17 of aluminum, the disk 16 of aluminum.The central portion of cap 17 is to organizing 6 an opposite side (outside batteries side) protrusions with coiling, and the thickness of cap 17 is set at 1mm in this example.Disk 16 is for discoid and be central portion and organize the ware shape shape that 6 sides are protruded to coiling, so that the peristome of clad battery container 10.The thickness of disk 16 is set at 0.5mm in this example.The peripheral part of disk 16 upper surface side to the peripheral part of cap 17 in the complete cycle scope is turned back.In the complete cycle scope of peripheral part, implemented laser welding towards the part of turning back (the black arrow A direction Fig. 8) from the upper surface side of turning back.
As shown in Figure 1, top cover 11 is fixed in the peristome on battery case 10 tops through packing ring 15 ca(u)lks of acrylic resin system.Therefore, battery case 10 is sealed airtight by top cover 11.In addition, in battery case 10, be injected with nonaqueous electrolytic solution.Nonaqueous electrolytic solution uses the liquid obtain like this: dissolve lithium hexafluoro phosphate (LiPF in the volume ratio of ethylene carbonate and dimethyl carbonate is 2: 3 mixed solvent
6) to make the hexafluorophosphoric acid lithium concentration be 1 mol.
As shown in Figure 2, the positive plate 2 of formation coiling group 6 has aluminium foil as positive electrode collector.The thickness of aluminium foil is set at 20 μ m in this example.On the two sides of aluminium foil, roughly be coated with the cathode mixture that contains positive active material equably.Positive active material uses for example uses chemical formula LiMn
2O
4The powder of the lithium transition-metal complex oxides such as high manganese lithium of expression.In cathode mixture, positive active material, be 85: 8: 2 as the powdered graphite of main electric conducting material, as the acetylene black of secondary, conductive material with as the Kynoar of binding agent (bond) (below be abbreviated as PVDF) with for example mass ratio: 5 mode cooperates.When aluminium foil applies cathode mixture, with dispersion solvent adjustment viscosity such as N-N-methyl-2-2-pyrrolidone N-(below be abbreviated as NMP) and modulate slurry.With positive plate 2 punching press after drying, making it form width is the band shape of 88mm.At the lateral margin of long dimensional directions one side of aluminium foil, be formed with width and be uncoated 1 of the cathode mixture of 6mm.
On the other hand, as shown in Figure 3, negative plate 4 has rolled copper foil as negative electrode collector.The thickness of rolled copper foil is set at 20 μ m in this example.On the two sides of rolled copper foil, roughly be coated with the negative pole intermixture equably, the negative pole intermixture contains the powder of the material with carbon elements such as easy graphitized carbon that can reversibly absorb, emit lithium ion as negative electrode active material.In the negative pole intermixture, for example in 92 mass parts of easy graphitized carbon powder, cooperate the PVDF of 8 mass parts.When rolled copper foil applies the negative pole intermixture, adjust viscosity and modulate slurry with dispersion solvents such as NMP.With negative plate 4 punching press after drying, making it form width is the band shape of 89mm.At the lateral margin of long dimensional directions one side of rolled copper foil, the same with positive plate 2, be formed with width and be uncoated 3 of the negative pole intermixture of 3mm.In addition, negative electrode active material is adjusted to the coated weight of rolled copper foil: making when initial charge amount of lithium ions of emitting from positive plate 2 and the amount of lithium ions that is absorbed by negative plate 4 when initial charge is 1: 1.
(battery assembling)
Assemble lithium rechargeable battery 20 as described below.At first, load current collection disk 7 in the upper surface of coiling group 6, and make current collection disk 7 another side (not forming the face of convex shaped part 8) plane part be positioned at coiling and organize the end butt of uncoated 1 of the cathode mixture of 6 upper surfaces.From the top (top of current collection disk 7) of convex shaped part 8, along length direction (radial direction of the current collection disk 7) irradiating laser of convex shaped part 8.Make a part of fusion of convex shaped part 8 and current collection disk 7 by irradiation, get up with the back side (lower surface of the current collection disk 7) side of coplanar laser illumination with the engaged at end of uncoated 1 of the cathode mixture in each week (50 layers) of this back side butt with laser.That is, in the part of convex shaped part 8 and current collection disk 7 during because of the laser radiation fusion, puddle forms protuberance because of gravity hangs down to the lower face side of current collection disk 7.Protuberance forms the weld mark of laser radiation.After laser radiation, this protuberance stays as the fusion vestige, is formed with the part general planar of convex shaped part 8.For four convex shaped parts 8, from the upper surface side irradiating laser of convex shaped part 8, weld end with uncoated 1 of the cathode mixture of lower surface butt by successively.Then, for the end and the current collection disk 7 of uncoated 3 of negative pole intermixture, also similarly weld with the end of uncoated 1 of cathode mixture and the welding of current collection disk 7.At this moment, the coiling group 6 that is welded with the current collection disk 7 of side of the positive electrode is turned upside down uncoated 3 of negative pole intermixture carried out towards upside.
Here, laser welding is described.Shown in Fig. 7 (B), when from the top when being formed on convex shaped part 8 irradiating lasers on the current collection disk 7, a part of fusion of convex shaped part 8 and current collection disk 7, puddle hangs down and forms the protuberance 22 that the cross section is a semicircle shape to the lower face side of current collection disk 7 because of gravity.Protuberance 22 forms accordingly with convex shaped part 8, between uncoated 1 of the cathode mixture that this protuberance 22 enters into coiling group 6 (negative pole intermixture uncoated 3 between also be same).After laser radiation, puddle hangs down and protuberance 22 cooling curings that form and residual as the fusion vestige.Therefore, the end (end that the negative pole intermixture is uncoated 3) of uncoated 1 of cathode mixture engages with current collection disk 7.At this moment, the position of the upper bottom surface of convex shaped part 8 drops to the position of the upper surface of current collection disk 7, becomes general planar.
Then, with the ultrasonic wave bonding method negative wire 13 is installed organizing on the face of 6 opposite sides of the current collection disk 7 of negative side with coiling.Is that the mode of the bottom surface side of battery case 10 is accommodated in the battery case 10 with coiling group 6 that negative wire 13 is installed with negative wire 13.The lower surface of negative wire 13 and the inner bottom surface of battery case 10 are joined together with resistance welded.Behind joint,, the welding position of negative wire 13 and battery case 10 is increased from the outside irradiating laser of battery case 10 bottom surfaces.
Then, with an end of positive wire 14 by the upper surface of solder joints at the current collection disk 7 of side of the positive electrode, and with the other end of positive wire 14 by the lower surface of solder joints at the disk 16 that constitutes top cover 11.Then, in battery case 10, inject nonaqueous electrolytic solution.The injection rate of nonaqueous electrolytic solution is set at 50g in this example.After nonaqueous electrolytic solution injected, the peristome that top cover 11 ca(u)lks is fixed on battery case 10 by packing ring 15 sealed airtight, thereby finishes lithium rechargeable battery 20.
(embodiment)
Below, according to present embodiment, the embodiment of the lithium rechargeable battery 20 produced is described.
(embodiment 1)
In embodiment 1, when uncoated 3 end is respectively on the current collection disk 7 of laser welding in side of the positive electrode, negative side in uncoated 1 with cathode mixture end, negative pole intermixture, upper bottom surface at convex shaped part 8 correctly focuses on (just focus), in the welding of side of the positive electrode feed speed is set at the 5m/ branch, then is set at the 4m/ branch in the welding of negative side.The irradiation output of laser is set at 650W, then is set at 600W in the welding of negative side in the welding of side of the positive electrode.
Extract arbitrarily resulting coiling group 6 out, along the direction of weld mark, promptly, cut off along the cross-wise direction of the direction upper edge aluminium foil of protuberance 22, observe the junction surface.Though the situation at junction surface has small in such poor of the difference that does not also reach the whole embodiment of aftermentioned, side of the positive electrode, negative side are all roughly the same.As shown in Figure 9, junction surface 25 with from the engagement end portion of uncoated 1 of cathode mixture towards current collection disk 7 gradually the width of (gradually) expansion increase shape and weld.Such situation, can be observed at the place, junction surface of 35 layers of average out in the junction surface of uncoated 1 of the cathode mixture that has 50 layers for a weld mark (in the part of four radiation linearities one).Hence one can see that, and junction surface 25 is 70% with respect to the percentage of junction surface sum.The expanded-angle P of expansion starting position S is an acute angle, and junction surface 25 is acute angle-shaped.Between adjacent junction surface 25, formed protuberance 22 at the lower surface of current collection disk 7.The front position of protuberance 22 is positioned at the position of more leaning on current collection disk 7 sides than expansion starting position S.
As shown in figure 10, in 15 layers beyond being formed with 35 layers of junction surface 25, formed shape and be not the junction surface of expanding gradually from the thickness of uncoated 1 of cathode mixture 26.In other words, in the junction surface that the average out in 50 layers is 15 layers, do not carry out the welding that width increases shape.Junction surface 26 is 30% with respect to the percentage of junction surface sum.
Measure AC impedance to any 10 in the lithium rechargeable battery 20 that obtains.In the mensuration of AC impedance, at room temperature with lithium rechargeable battery 20 with the constant current charge of 2A behind 4.0V, then the constant-potential charge with 4.0V drops to 0.1A to electric current, and ambient temperature, battery temperature are all the AC impedance (for the embodiment below the present embodiment too) of mensuration 1kHz under 25 ± 0.5 ℃ the condition around.In the lithium rechargeable battery 20 of embodiment 1, AC impedance average out to 2.47m Ω.
(embodiment 2)
In embodiment 2, the irradiation of the laser when making laser welding output for 700W, is 630W in the welding of negative side in the welding of side of the positive electrode, and is identical with embodiment 1 in addition.Be formed with the situation at junction surface 25, for a weld mark, 40 layers of average out to add up to 80% with respect to the junction surface.The expanded-angle P of expansion starting position S is an acute angle.Be formed with protuberance 22 between adjacent junction surface 25, the front position of protuberance 22 is positioned at the position of more leaning on current collection disk 7 sides than expansion starting position S.Being formed with in per 50 layers of the position at junction surface 26 on average has 10 layers, adds up to 20% with respect to the junction surface.To any 10 results that measure AC impedance in the lithium rechargeable battery 20 of embodiment 2 are average out to 2.07m Ω.
(embodiment 3)
In embodiment 3, the irradiation of the laser when making laser welding output for 750W, is 650W in the welding of negative side in the welding of side of the positive electrode, and is identical with embodiment 1 in addition.Be formed with the situation at junction surface 25,, add up to 92% with respect to the junction surface for 46 layers of weld mark average out to.The expanded-angle P of expansion starting position S is an acute angle.Be formed with protuberance 22 between adjacent junction surface 25, the front position of protuberance 22 is positioned at the position of more leaning on current collection disk 7 sides than expansion starting position S.Being formed with in per 50 layers of the position at junction surface 26 on average has 4 layers, adds up to 8% with respect to the junction surface.To any 10 results that measure AC impedance in the lithium rechargeable battery 20 of embodiment 3 are average out to 2.00m Ω.
(embodiment 4)
In embodiment 4, the irradiation of the laser when making laser welding output for 900W, is 750W in the welding of negative side in the welding of side of the positive electrode, and is identical with embodiment 1 in addition.Be formed with the situation at junction surface 25,, add up to 76% with respect to the junction surface for 38 layers of weld mark average out to.The expanded-angle P of expansion starting position S is an acute angle.Be formed with protuberance 22 between adjacent junction surface 25, the front position of protuberance 22 is positioned at the position of more leaning on current collection disk 7 sides than expansion starting position S.Being formed with in per 50 layers of the position at junction surface 26 on average has 4 layers, adds up to 8% with respect to the junction surface.For in 50 layers remaining 8 layers, observed the fusing of uncoated 3 of uncoated 1 of cathode mixture or negative pole intermixture.To any 10 results that measure AC impedance in the lithium rechargeable battery 20 of embodiment 4 are average out to 2.38m Ω.
(embodiment 5)
In embodiment 5, the irradiation of the laser when making laser welding output for 550W, is 500W in the welding of negative side in the welding of side of the positive electrode, and is identical with embodiment 1 in addition.All be from the shape of expanding gradually towards current collection disk 7 with the engagement end portion of cathode mixture uncoated 1 (uncoated 3 of negative pole intermixture) along the cross sectional shape of the weld mark at junction surface at side of the positive electrode, negative side.As shown in figure 11, junction surface 27 forms width and increases shape, and the expanded-angle P of expansion starting position S is the obtuse angle.Be formed with the situation at junction surface 27, on average have 30 layers, add up to 60% with respect to the junction surface for a weld mark.Be formed with protuberance 22 between adjacent junction surface 27, the front position of protuberance 22 is positioned at the position of more leaning on current collection disk 7 sides than expansion starting position S.Being formed with in per 50 layers of the position at junction surface 26 on average has 20 layers, adds up to 40% with respect to the junction surface.To any 10 results that measure AC impedance in the lithium rechargeable battery 20 of embodiment 5 are average out to 2.56m Ω.
(embodiment 6)
In embodiment 6, use the current collection disk 7 of the size that has changed convex shaped part 8.That is, shown in Fig. 6 (B), with respect to the thickness 0.2mm of current collection disk 7, the width setup of upper base is 0.4mm, and the width setup of going to the bottom is 1.0mm, and height setting is 1.2mm.The irradiation output of the laser when making laser welding is 900W in the welding of side of the positive electrode, in the welding of negative side 750W, when producing battery in the same manner with embodiment 1 in addition, in 10, there is one and observes the internal short-circuit symptom, so the battery decomposition is investigated.Increase shape though the junction surface forms width, expansion starting position S forms than the ora terminalis of dividing plate 5 (with current collection disk 7 opposite sides) more in the inner part, and it is damaged to observe fusion in the part of dividing plate 5.Think thus: in embodiment 6, because the volume of the convex shaped part 8 of current collection disk 7 increases, quantitative change is big so the fusion that when welding produces because of laser radiation is hung down, and the protuberance 22 of formation becomes big, thereby the expansion starting position S at junction surface forms than the ora terminalis of dividing plate 5 and more organizes 6 sides by coiling.Therefore, can infer and contact with negative plate at the fusion defect place of dividing plate 5 positive plate and internal short-circuit takes place.
(embodiment 7)
In embodiment 7, making the width of uncoated 1 of cathode mixture is 5mm, and to make the width of uncoated 3 of negative pole intermixture be 2mm, for any one all makes and forms coiling to organize 6 o'clock amounts of leaning out from dividing plate 5 be 1mm in uncoated 3 of uncoated 1 of cathode mixture and the negative pole intermixture, identical with embodiment 1 in addition.In resulting lithium rechargeable battery 20, in 10, there is one and observes the internal short-circuit symptom, so the battery decomposition is investigated.Increase shape though the junction surface forms width, expansion starting position S forms than the ora terminalis of dividing plate 5 more in the inner part, and it is damaged to observe fusion in the part of dividing plate 5.Think thus: in embodiment 7,, more organize 6 sides by coiling so the expansion starting position S at junction surface forms than the ora terminalis of dividing plate 5 owing to reduced uncoated 1 of cathode mixture and uncoated 3 amount of leaning out of negative pole intermixture from dividing plate 5.Therefore, can infer and contact with negative plate at the fusion defect place of dividing plate 5 positive plate and internal short-circuit takes place.
Table 1
| ? | The welding rate (angle) that expansion is arranged | The welding rate that does not have expansion | AC | Remarks |
| Embodiment | ||||
| 1 | 70% (acute angle) | 30％? | 2.47mΩ? | ? |
| |
80% (acute angle) | 20％? | 2.07mΩ? | ? |
| |
92% (acute angle) | 8％? | 2.00mΩ? | ? |
| Embodiment 4 | 76% (acute angle) | 8％? | 2.38mΩ? | Paper tinsel fusing 16 |
| Embodiment | ||||
| 5 | 60% (obtuse angle) | 40％? | 2.56mΩ? | ? |
As shown in table 1, in embodiment 1～embodiment 5, though all formed the junction surface 25 that width increases shape, as can be known: by changing the irradiation output of laser, the situation of junction surface integral body changes.As can be known: have the welding rate of expansion high more, AC impedance is low more, and battery performance is good more.Particularly in the welding rate that expansion is arranged is embodiment 2, embodiment 3 more than 80%, can be clear and definite: AC impedance is further reduced.Deducibility goes out: in the junction surface 26 that does not have expansion, can not obtain enough welding capacity (volume), the resistance between uncoated 3 of uncoated 1 of current collection disk 7 and cathode mixture or the negative pole intermixture is decline not.In the embodiment 4 of the irradiation output that has improved laser, think:,, have the welding rate of expansion not improve so uncoated 3 of uncoated 1 of cathode mixture or negative pole intermixture fuse because irradiation energy is strong excessively.Otherwise in the embodiment 5 of irradiation energy deficiency, the junction surface forms roughly coniform, is the junction surface 27 at obtuse angle but formed the expanded-angle P that expands starting position S, has the welding rate of expansion also insufficient.
Therefore, the irradiation output the when size by being adjusted on the current collection disk 7 convex shaped part 8 that forms, laser welding can increase the ratio that forms junction surface 25, and its result is, judges AC impedance is reduced.Such lithium rechargeable battery 20 has been owing to reduced internal resistance, so can be used in the purposes of the high efficiency orientation that the power supply of the electric tool that carries out high current charge-discharge and hybrid vehicle etc. uses well.
(effect etc.)
Next, effect of the lithium rechargeable battery 20 of present embodiment etc. is described.
In the present embodiment, both ends of the surface in coiling group 6 dispose current collection disk 7 in opposed mode respectively, and the end that end that cathode mixture is uncoated 1 and negative pole intermixture are uncoated 3 utilizes laser welding respectively and organizes on the face of 6 sides by the coiling that a plurality of junction surfaces are bonded on current collection disk 7.A part of junction surface in the junction surface forms the junction surface 25 that is the width increase shape of expanding gradually towards current collection disk 7.Owing to formed a plurality of junction surfaces,, can reduce internal resistance so the current collection path increases.Have, and be width and increase shape correspondingly, the volume at junction surface 25 increases, so can suppress internal resistance less.In addition, in the present embodiment since by make be junction surface 25 that width increases shape with respect to the ratio of junction surface sum more than 80%, the volume at junction surface is increased, so can reduce AC impedance (with reference to embodiment 2, embodiment 3).Have again, in the present embodiment,,, can make the increase quantitative change of volume big so be that the situation at obtuse angle is compared with expanded-angle P because junction surface 25 is an acute angle for expanded-angle P acute angle-shaped, that promptly expand starting position S.Therefore, can suppress internal resistance littler (with reference to Fig. 9, Figure 11).
In addition, in the present embodiment, on current collection disk 7, formed radial convex shaped part 8, joined on the current collection disk 7 by end (end that the negative pole intermixture is uncoated 3) to uncoated 1 of these convex shaped part 8 irradiating laser with cathode mixture.Therefore, the junction surface is organized at the coiling of current collection disk 7 on the face of 6 sides and is arranged linearlyly.Because the irradiation by linearity ground scan laser forms the junction surface, so can easily engage.In addition, in the present embodiment, organize at the coiling of current collection disk 7 on the face of 6 sides, formed protuberance 22 between the adjacent junction surface in the junction surface that forms linearlyly.The front end of this protuberance 22 is positioned at the position of more leaning on current collection disk 7 sides than the expansion starting position S at junction surface 25.Protuberance 22 is that the part of convex shaped part 8, the current collection disk 7 of fusion during by laser welding is organized 6 sides to coiling and hung down and form, but the front end of protuberance 22 is positioned at than the expansion starting position S at junction surface 25 more by the position of current collection disk 7 sides, so thereby puddle can further hang down along uncoated 1 of cathode mixture, uncoated 3 of negative pole intermixture and is easy to form roughly cone shape junction surface 25.
Have, in the present embodiment, the expansion starting position S at junction surface 25 is positioned at the position of more leaning on current collection disk 7 sides than the position of the ora terminalis of dividing plate 5 again.Therefore, the puddle of junction surface 25 and protuberance 22 can not contact dividing plate 5 when laser welding, and the heat of following laser welding to produce is difficult to be delivered to dividing plate 5, so can prevent the fusion damage of dividing plate 5.
Also have, in the present embodiment, organize on the face of 6 sides, engage uncoated 1 of cathode mixture, uncoated 3 of negative pole intermixture respectively at the coiling of the current collection disk 7 of side of the positive electrode, negative side.Therefore, be processed into rectangle broach shape, the situation of collector plate perhaps be installed on collector body compare, do not need time of processing and installing, can improve manufacturing efficient with the collector body that will constitute positive plate, negative plate respectively.In addition, be processed into rectangle broach shape with coiling or the positive plate of collector plate has been installed, the situation of negative plate is compared, owing to when the making of coiling group 6, can under engaging-in state such as collector plate, not batch, can get rid of fully yet so damage the bad possibility of the operation of the insulation between both positive and negative polarity.Have again, with relative on the lateral margin that in a covered manner end face of coiling group is gathered and is bonded on the current collection disk with collector plate etc., in the present embodiment, uncoated 1 of cathode mixture, uncoated 3 end face that can not cover coiling group 6 of negative pole intermixture, and, on current collection disk 7, be formed with slit 9, so can guarantee the permeation pathway of nonaqueous electrolytic solution in coiling group 6.Thus, can shorten the time of nonaqueous electrolytic solution, cause also can getting rid of fully in the principal element of system time increase to 6 infiltrations of coiling group.Therefore,, can reduce AC impedance, and can get rid of the possibility that causes that internal short-circuit and voltage descend, so can obtain the lithium rechargeable battery of high-performance, high reliability by forming above-mentioned junction surface 25.
Have again, in the present embodiment, as the electrode body illustration positive plate, negative plate are wound up and the coiling group 6 that constitutes, but the present invention is not limited to this, also can be with rectangular shape or round-shaped etc. positive plate, the multilayer electrode group that negative plate is laminated across dividing plate.In addition, in the present embodiment, though show the example that has all disposed current collection disk 7 in side of the positive electrode, negative side, the present invention is not limited to this.For example, also can be at negative side configuration current collection disk 7, the end of uncoated 3 of negative pole intermixture directly is bonded on the inner bottom surface of battery case 10 by laser welding.This can use the material identical with negative electrode collector to realize by for example making battery case 10.In addition, in the present embodiment, show battery case 10 and be also used as the example that negative outer terminal, top cover 11 are also used as anodal outside terminal, but the present invention is not limited to this, also can make battery case 10 as anodal outside terminal, make top cover 11 as negative outer terminal.
In addition, in the present embodiment, show the example that on current collection disk 7, forms radial convex shaped part 8, but the present invention is not limited to this, for example, can form a plurality of convex shaped parts by curve-likes such as involutes.In addition, for the quantity of radial convex shaped part 8, being not limited to four, for example, also can be three or six.Have again, do not need to make all radial convex shaped parts 8 to be formed into circumference, for example, can make a part be formed into circumference midway from radial direction from the central part of current collection disk 7.
Have again, in the present embodiment, as the current collection parts and illustration current collection disk 7, but the present invention is not limited to this, as long as be formed with the required convex shaped part of laser welding 8.For example, under the situation of using the multilayer electrode group, also can be the current collection parts of rectangular shape, its shape is also unrestricted.In addition, in the present embodiment, the junction surface 25 that forms by laser welding is width increase shape.By from the top to convex shaped part 8 irradiating lasers of current collection disk 7, puddle forms junction surface 25 because of gravity hangs down, so that junction surface 25 is generally is roughly coniform.For example, under the situation that current collection disk 7 tilts when laser welding, cross sectional shape becomes asymmetrical width and increases shape.Therefore, increase shape as long as junction surface of the present invention forms width, and be not limited to symmetry.
Have again, in the present embodiment, show and apply the example that cathode mixture, negative pole intermixture constitute positive plate 2, negative plate 4 on the two sides of aluminium foil, rolled copper foil respectively, but the present invention is not limited to this.For example, in coiling group 6, not with cathode mixture coated side and the opposed part of negative pole intermixture coated side, also can form partly and only be the painting part of single face.In addition, shape and size for battery also are not particularly limited certainly.
(industrial practicality)
Since the invention provides the lithium ion secondary cell that can suppress internal resistance littler, thus help manufacturing, the sale of lithium ion secondary cell, thereby have industrial practicality.
Claims (9)
1. lithium rechargeable battery, it has electrode body, this electrode body constitutes by positive plate and negative plate are disposed across dividing plate, above-mentioned positive plate is coated with the cathode mixture based on positive active material on collector body, above-mentioned negative plate is coated with the negative pole intermixture based on negative electrode active material on collector body, it is characterized in that
The end of at least one side in the collector body of above-mentioned positive plate and negative plate disposes projectedly from the end face of above-mentioned electrode body, the end of above-mentioned collector body is bonded on by a plurality of junction surfaces on the face on above-mentioned electrode side of current collection parts, above-mentioned current collection parts are the material identical with above-mentioned collector body, and to dispose with the opposed mode of the end face of above-mentioned electrode body, at least a portion in the above-mentioned junction surface is from the width of expanding gradually towards above-mentioned current collection parts with the engagement end portion of above-mentioned collector body and increases shape, and
Be the quantity at junction surface that above-mentioned width increases shape with respect to the ratio of the sum at above-mentioned junction surface more than 80%.
2. lithium rechargeable battery according to claim 1 is characterized in that,
Above-mentioned junction surface is many curve-likes on the face on the above-mentioned electrode side of above-mentioned current collection parts or linearity ground is arranged.
3. lithium rechargeable battery according to claim 2 is characterized in that,
On the face on the above-mentioned electrode side of above-mentioned current collection parts, in the junction surface of above-mentioned arrangement, has convex shaped part between the adjacent junction surface.
4. lithium rechargeable battery according to claim 3 is characterized in that,
The front end of above-mentioned convex shaped part is positioned at the position of more leaning on above-mentioned current collection component side than the expansion starting position at the junction surface that is above-mentioned width increase shape.
5. lithium rechargeable battery according to claim 4 is characterized in that,
Being expansion starting position that above-mentioned width increases the junction surface of shape is positioned at than the position of the ora terminalis of aforementioned barriers more by the position of above-mentioned current collection component side.
6. lithium rechargeable battery according to claim 4 is characterized in that,
The junction surface and the engagement end portion above-mentioned collector body that is above-mentioned width increase shape is acute angle-shaped.
7. lithium rechargeable battery according to claim 1 is characterized in that,
The end forms the uncoated portion of above-mentioned cathode mixture or negative pole intermixture at the lateral margin of a side from the collector body of the end face protrusion of above-mentioned electrode body.
8. lithium rechargeable battery according to claim 7 is characterized in that,
Part or all of above-mentioned uncoated portion protruded from the ora terminalis of aforementioned barriers, and the end of the protrusion of this uncoated portion is from the end face protrusion of above-mentioned electrode body.
9. lithium rechargeable battery according to claim 1 is characterized in that,
At least a portion at above-mentioned junction surface is from the width of expanding gradually towards above-mentioned current collection parts linearity ground with the engagement end portion of above-mentioned collector body and increases shape.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007-135333 | 2007-05-22 | ||
| JP2007135333A JP2008293681A (en) | 2007-05-22 | 2007-05-22 | Lithium-ion secondary battery |
| JP2007135333 | 2007-05-22 |
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| CN101312236A CN101312236A (en) | 2008-11-26 |
| CN101312236B true CN101312236B (en) | 2010-12-01 |
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| US (1) | US8053105B2 (en) |
| EP (1) | EP1995805B1 (en) |
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| US8697275B2 (en) * | 2009-03-04 | 2014-04-15 | Samsung Sdi Co., Ltd. | Rechargeable battery having an extendable case region |
| US8530068B2 (en) * | 2010-03-10 | 2013-09-10 | Hitachi Vehicle Energy, Ltd. | Square battery and manufacturing method of the same |
| JP2012185912A (en) * | 2011-03-03 | 2012-09-27 | Hitachi Vehicle Energy Ltd | Cylindrical secondary cell |
| CN102916159B (en) * | 2012-11-06 | 2014-12-24 | 徐敖奎 | High-power lithium battery |
| CN105742527B (en) * | 2016-03-18 | 2018-10-16 | 国轩新能源（苏州）有限公司 | A kind of cylindrical lithium ion power battery of high energy than, long-life |
| CN105742721A (en) * | 2016-04-27 | 2016-07-06 | 国轩新能源（苏州）有限公司 | High-energy-ratio low-internal-resistance cylindrical lithium ion battery |
| KR102217444B1 (en) * | 2017-04-06 | 2021-02-22 | 주식회사 엘지화학 | Electrode assembly and manufactureing method for the same |
| DE102019204105A1 (en) * | 2019-03-26 | 2020-10-01 | Robert Bosch Gmbh | Battery cell with improved cooling |
| CN114473210A (en) * | 2022-01-27 | 2022-05-13 | 天津力神电池股份有限公司 | Current collecting disc structure of circular lithium ion battery and welding method |
| CN115051123B (en) * | 2022-08-11 | 2022-12-02 | 楚能新能源股份有限公司 | Full utmost point ear electricity core structure |
| CN115295860B (en) * | 2022-10-09 | 2022-12-20 | 深圳海润新能源科技有限公司 | Preparation method of secondary battery, secondary battery and battery module |
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- 2008-03-27 US US12/057,329 patent/US8053105B2/en not_active Expired - Fee Related
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| EP1102337A1 (en) * | 1999-04-08 | 2001-05-23 | Matsushita Electric Industrial Co., Ltd. | Secondary battery |
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Also Published As
| Publication number | Publication date |
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| EP1995805B1 (en) | 2013-05-15 |
| CN101312236A (en) | 2008-11-26 |
| US20080292961A1 (en) | 2008-11-27 |
| US8053105B2 (en) | 2011-11-08 |
| JP2008293681A (en) | 2008-12-04 |
| EP1995805A1 (en) | 2008-11-26 |
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